<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 头部的警告区域 -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning"
        :closable="false"
        show-icon
      >
      </el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="cateList"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>

      <!-- tab页签区域 -->
      <el-tabs
        v-model="activeName"
        @tab-click="handleTabClick"
      >
        <!-- 添加动态参数的面板 -->
        <el-tab-pane
          label="动态参数"
          name="many"
        >
          <!-- 添加参数的按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible=true"
          >添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table
            :data="manyTableData"
            border
            stripe
          >
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  v-for="(item,i) in scope.row.attr_vals"
                  :key="i" closable @close="handleClose(i,scope.row)"
                >{{item}}</el-tag>
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column
              label="#"
              type="index"
            ></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane
          label="静态属性"
          name="only"
        >
          <!-- 添加属性的按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible=true"
          >添加属性</el-button>
          <!-- 静态属性表格 -->
          <el-table
            :data="onlyTableData"
            border
            stripe
          >
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  v-for="(item,i) in scope.row.attr_vals"
                  :key="i" closable @close="handleClose(i,scope.row)"
                >{{item}}</el-tag>
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column
              label="#"
              type="index"
            ></el-table-column>
            <el-table-column
              label="属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加'+titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item
          :label="titleText"
          prop="attr_name"
        >
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span
        slot="footer"
        class="dialog-footer"
      >
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button
          type="primary"
          @click="addParams"
        >确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数对话框 -->
    <el-dialog
      :title="'修改'+titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item
          :label="titleText"
          prop="attr_name"
        >
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span
        slot="footer"
        class="dialog-footer"
      >
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button
          type="primary"
          @click="editParams"
        >确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
    data(){
        return{
            // 商品分类列表
            cateList:[],
            // 级联选择框的配置对象
            cateProps:{
                expandTrigger: 'hover',
                value:'cat_id',
                label:'cat_name',
                children:'children'
            },
            // 级联选择框双向绑定到的数组
            selectedCateKeys:[],
            // 被激活的页签的名称
            activeName:'many',
            manyTableData:[],
            onlyTableData:[],
            // 控制添加对话框的显示与隐藏
            addDialogVisible:false,
            // 添加参数的表单数据对象
            addForm:{
                attr_name:''
            },
            // 添加表单的验证规则对象
            addFormRules:{
                attr_name:[
                    {required:true,message:'请输入参数名称',trigger:'blur'}
                ]
            },
            // 控制修改对话框的显示与隐藏
            editDialogVisible:false,
            // 修改的表单数据对象
            editForm:{},
            // 修改表单的验证规则对象
            editFormRules:{
                attr_name:[
                    {required:true,message:'请输入参数名称',trigger:'blur'}
                ]
            }
        }
    },
    created(){
        // 获取所有的商品分类列表
        this.getCateList()
    },
    methods:{
        async getCateList(){
            const {data:res}=await this.$http.get('categories')
            
            if(res.meta.status!==200){
                return this.$message.error('获取商品分类失败！')
            }

            this.cateList=res.data

            console.log(this.cateList)


        },
        // 级联选择框选中项变化会触发这个函数
         handleChange(){
            this.getParamsData()
        },
        // tab页签点击事件的处理函数
        handleTabClick(){
            this.getParamsData()
            console.log(this.activeName)
        },
        // 获取参数的列表数据
        async getParamsData(){
            // 证明选中的不是三级分类
            if(this.selectedCateKeys.length!==3){
                this.selectedCateKeys=[]
                this.manyTableData = []
                this.onlyTableData = []
            return
            }
            // 证明选中的是三级分类
            console.log(this.selectedCateKeys)
            // 根据所选分类的id和当前所处的面板获取对应的参数
            const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})

            if(res.meta.status!==200){
                return this.$message.error('获取参数列表失败！')
            }

            
            res.data.forEach(item =>{
              item.attr_vals=item.attr_vals ? 
              item.attr_vals.split(' ') : []
              // 控制文本框的显示与隐藏
              item.inputVisible = false
              // 文本框中输入的值
              item.inputValue=''
            })

            console.log(res.data)

            if(this.activeName==='many'){
                this.manyTableData=res.data
            }else{
                this.onlyTableData=res.data
            }
        },
        // 监听添加对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        // 点击按钮，添加参数
        addParams(){
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid)return
                const {data:res}=await this.$http.post(`categories/${this.cateId}/attributes`,{
                    attr_name:this.addForm.attr_name,
                    attr_sel:this.activeName
                })

                if(res.meta.status!==201){
                  return this.$message.error('添加参数失败！')
                }

                this.$message.success('添加参数成功！')
                this.addDialogVisible=false
                this.getParamsData()
            })
        },
        // 点击按钮，展示修改对话框
        async showEditDialog(attr_id){
          // 查询当前参数的信息
          const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{params:{attr_sel:this.activeName}})

          if(res.meta.status!==200){
            return this.$message.error('获取参数信息失败！')
          }

          this.editForm=res.data
          this.editDialogVisible=true

        },
        // 重置修改的表单
        editDialogClosed(){
          this.$refs.editFormRef.resetFields()
        },
        // 点击按钮，修改参数信息
        editParams(){
          this.$refs.editFormRef.validate(async valid=>{
            if(!valid)return
            const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{attr_name:this.editForm.attr_name,attr_sel:this.activeName}
            )

            if(res.meta.status!==200){
              return this.$message.error('修改参数失败！')
            }

            this.$message.success('修改参数成功！')
            this.getParamsData()
            this.editDialogVisible=false
          })
        },
        // 根据id删除对应的参数项
        async removeParams(attr_id){
          const confirmResult=await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err=>err)

        // 用户取消了该次操作
        if(confirmResult!=='confirm'){
          return this.$message.info('已取消删除！')
        }

        // 删除的业务逻辑
        const {data:res}=await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)

        if(res.meta.status!==200){
          return this.$message.error('删除参数失败！')
        }

        this.$message.success('删除参数成功！')

        this.getParamsData()
        },
        // 文本框失去焦点或摁下了enter键都会触发
        async handleInputConfirm(row){
          if(row.inputValue.trim().length===0){
            row.inputValue = ''
            row.inputVisible=false
            return 

          }
          // 如果没有return，则证明输入了内容，需要做后续处理
          row.attr_vals.push(row.inputValue.trim()
          )

          row.inputValue=''
          row.inputVisible=false

          // 需要发起请求，保存这次操作
          this.saveAttrVals(row)
        },
        // 将对attr_vals的操作，报讯到数据库
        async saveAttrVals(row){
          const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
            attr_name:row.attr_name,
            attr_sel:row.attr_sel,
            attr_vals:row.attr_vals.join(' ')
          }
          )

          if(res.meta.status!==200){
            return this.$message.error('修改参数项失败！')
          }

          this.$message.success('修改参数项成功！')
        },
        // 点击按钮，按钮展示文本输入框
        showInput(row){
          row.inputVisible=true
          // 让文本框自动获得焦点
          // $nextTick方法的作用，就是当页面上元素被重新渲染之后执行回调函数中的代码
          this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
        },
        // 删除对应的参数可选项
        handleClose(i,row){
          row.attr_vals.splice(i,1)
          this.saveAttrVals(row)
        }

        
    },
    computed:{
        // 如果按钮需要被禁用，则返回true,否则返回false
        isBtnDisabled(){
            if(this.selectedCateKeys.length !==3){
                return true
            }
            return false
        },
        // 当前选中的三级分类的id
        cateId(){
            if(this.selectedCateKeys.length===3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算标题的文本
        titleText(){
            if(this.activeName==='many'){
                return '动态参数'
            }
            return '静态属性'
        }
    }
}
</script>

<style lang="less" scoped>
.cat_opt{
    margin:15px 0px;
}

.el-tag{
  margin:10px;
}

.input-new-tag{
  width:120px;
}
</style>